how to become administrator in Vista

By default, Vista administrator account is "hidden". This post shows how to activate it:
http://www.howtogeek.com/howto/windows-vista/enable-the-hidden-administrator-account-on-windows-vista/

In brief:
- open a "administrator" command prompt (start->programs->accesories->commandprompt : R-cick and choose - run as admin)
- Type: net user administrator /active:yes
- Logout and you will now see admin acount when you log back in (it has no password)

To rehide admin:
- open admin command prompt
- type: net user administrator /active:no